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(11)

EP 4 247 564 A1

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(43) Date of publication: 27.09.2023 Bulletin 2023/39 (21) Application number: 21819582.4 (22) Date of filing: 19.11.2021

(51) International Patent Classification (IPC):  B03C 1/01(2006.01) G01N 1/10(2006.01) B03C 1/033(2006.01) B03C 1/28(2006.01) G01N 35/00(2006.01) (52) Cooperative Patent Classification (CPC): B03C 1/01; B03C 1/288; G01N 35/0098; B03C 1/0335; B03C 2201/18; B03C 2201/26; B01L 3/502761; B01L 2200/0668; B01L 2400/043; B01L 2400/0487; B01L 2300/0877; G01N 2035/00564 (86) International application number: PCT/IB2021/060771 (87) International publication number: WO 2022/107080 (27.05.2022 Gazette 2022/21)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 19.11.2020 US 202063115928 P (71) Applicant: DH Technologies Development PTE. Ltd. Singapore 739256 (SG)	(72) Inventor: LIU, Chang Concord, Ontario L4K 4V8 (CA) (74) Representative: J A Kemp LLP  80 Turnmill Street London EC1M 5QU London EC1M 5QU (GB)